Many are single edged, I expect at one time they all were, I think they were originaly a utility knife for farm labourers & miners of Chile, also carried & used as a weapon, but because of that, also a sign of masculinity etc. same as the jambya in the yemen, but because they were so famous for the horrific disembowelling injury's inflicted in the mostly drunken fighting that was common they became adopted by the army as the weapon of choice, {Who I guess recruited from the mine & farm labouring classes.}
spiral
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